A C-152 FLOWN BY A STUDENT PLT DEVELOPED CARB ICING. ACFT STALLED DURING FORCE LNDG ON THE HIGHWAY.

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I WAS IN THE NW PRACTICE AREA AT ABOUT 6000 FT WHEN THE ENG STARTED TO SLOWLY LOSE PWR. FINALLY; NEARLY ALL PWR WAS LOST AND I TRIED TO RESTART AND GO THROUGH THE EMER CHKLIST BUT NOTHING WORKED. I SAW AN OPEN ROAD AND CALLED 'MAYDAY' SEVERAL TIMES ON VGT FREQ BUT RECEIVED NO RESPONSE. THE PLANE REACHED CRITICALLY SLOW SPDS ON FINAL AND STALLED. THE AIRPLANE VEERED TO THE L AND IMPACTED NOSE-HVY. I SET UP FOR A 60 KTS APCH STRAIGHT-IN FOR A HIGHWAY AND KEPT A STRAIGHT FINAL UNTIL THE PLANE STALLED AND VEERED TO THE L. IT IMPACTED AT APPROX 30-40 KTS. ROAD UPWARD GRADE APPROX 5 DEGS. STALLED AT 15-20 FT ABOVE GND. NOSE GEAR AND PROP DAMAGED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR DISCUSSED INCIDENT WITH THE FAA; AND WAS RELIEVED OF RESPONSIBILITY FOR INCIDENT. FAA TOOK ACTION AGAINST THE FLT SCHOOL BECAUSE STUDENT PLT HAD NOT RECEIVED INSTRUCTION ON CARB ICING DETECTION OR ELIMINATION IN THE ACFT. RPTR STATED THAT TRAINING WAS FROM A REPUTABLE FLT SCHOOL; YET; IN 35 HRS; RPTR HAD 3 DIFFERENT INSTRUCTORS -- 'THEY KEPT LEAVING FOR OTHER JOBS.'